I'm not anti-marriage; if someone else wants to get married, that's their prerogative. I don't think it makes any sense, but it is something they can do entirely at their discretion.

What I'm against is the presumption that marriage (or commitment, or monoamory) is the sole pathway to happiness. Mind you, it does seem that future generations are more in line with my thinking, but there's always that culture war raging on.